diff --git a/flask_script/commands.py b/flask_script/commands.py
index 4d401eb..75c9eb7 100644
--- a/flask_script/commands.py
+++ b/flask_script/commands.py
@@ -115,7 +115,7 @@ def __init__(self, func=None):
                 self.option_list = []
             return
 
-        args, varargs, keywords, defaults = inspect.getargspec(func)
+        args, varargs, keywords, defaults = inspect.getfullargspec (func)[:4]
         if inspect.ismethod(func):
             args = args[1:]